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Leading edge repair

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Alpa3094
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Leading edge repair

Postby Alpa3094 » Sun Sep 13, 2020 8:07 pm

Hi Guys,

Today I had a damage on the leading edge on my Dice . Should I repair it or leaving it as it is? If it needs repair, how can I fix it properly ?
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GregK
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Re: Leading edge repair

Postby GregK » Sun Sep 13, 2020 8:36 pm

Easy/fast/probably-work-out-fine fix :
- if the bad scuff/near-tear is close enough to reach from the access zipper, clean the area around the damage inside and outside with isopropyl alcohol & dry
- cut a patch of Dacron sailtape about 5 cm longer than the scuff and 7 - 8 cm wide
- install the patch on the inside of the leading edge centred on the scuff, taking care not to stick the tape to the LE bladder
- place a narrow ( 2 cm wide ) Dacron sailtape patch about 1 cm longer than the scuff on the outside over the scuff to cover any adhesive from the inside patch that might come through and attract sand
- apply heat and pressure to patch area to maximize contact area and adhesion of the tape's pressure sensitive adhesive

A tape-only patch will probably be fine on a scuff/near-tear that is circumferential in orientation, as the axial stress from inflation pressure is only half the hoop stress. Only situation where the tape-only patch might be over-loaded and fail would be if the LE folded right at the tear.

For a worry-free rock-solid repair :
- open the LE closure seam at the tear
- clean the damaged area and dry
- apply Dacron sailtape patches to both sides
- perimeter zig-zag stitch around the outside patch
- re-stitch the LE closure seam

If a stitched repair isn't something you want or are equiped to handle, best to take it to a profession kite or sail repair service
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Alpa3094 (Sun Sep 13, 2020 9:43 pm)
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FLandOBX
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Re: Leading edge repair

Postby FLandOBX » Sun Sep 13, 2020 9:08 pm

GregK wrote:
Sun Sep 13, 2020 8:36 pm
Easy/fast/probably-work-out-fine fix :
- if the bad scuff/near-tear is close enough to reach from the access zipper, clean the area around the damage inside and outside with isopropyl alcohol & dry
- cut a patch of Dacron sailtape about 5 cm longer than the scuff and 7 - 8 cm wide
- install the patch on the inside of the leading edge centred on the scuff, taking care not to stick the tape to the LE bladder
- place a narrow ( 2 cm wide ) Dacron sailtape patch about 1 cm longer than the scuff on the outside over the scuff to cover any adhesive from the inside patch that might come through and attract sand
- apply heat and pressure to patch area to maximize contact area and adhesion of the tape's pressure sensitive adhesive

A tape-only patch will probably be fine on a scuff/near-tear that is circumferential in orientation, as the axial stress from inflation pressure is only half the hoop stress. Only situation where the tape-only patch might be over-loaded and fail would be if the LE folded right at the tear.

For a worry-free rock-solid repair :
- open the LE closure seam at the tear
- clean the damaged area and dry
- apply Dacron sailtape patches to both sides
- perimeter zig-zag stitch around the outside patch
- re-stitch the LE closure seam

If a stitched repair isn't something you want or are equiped to handle, best to take it to a profession kite or sail repair service
+1. This advice is perfect. :thumb:
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Alpa3094 (Sun Sep 13, 2020 9:43 pm)
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Alpa3094
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Re: Leading edge repair

Postby Alpa3094 » Sun Sep 13, 2020 9:43 pm

GregK wrote:
Sun Sep 13, 2020 8:36 pm
Easy/fast/probably-work-out-fine fix :
- if the bad scuff/near-tear is close enough to reach from the access zipper, clean the area around the damage inside and outside with isopropyl alcohol & dry
- cut a patch of Dacron sailtape about 5 cm longer than the scuff and 7 - 8 cm wide
- install the patch on the inside of the leading edge centred on the scuff, taking care not to stick the tape to the LE bladder
- place a narrow ( 2 cm wide ) Dacron sailtape patch about 1 cm longer than the scuff on the outside over the scuff to cover any adhesive from the inside patch that might come through and attract sand
- apply heat and pressure to patch area to maximize contact area and adhesion of the tape's pressure sensitive adhesive

A tape-only patch will probably be fine on a scuff/near-tear that is circumferential in orientation, as the axial stress from inflation pressure is only half the hoop stress. Only situation where the tape-only patch might be over-loaded and fail would be if the LE folded right at the tear.

For a worry-free rock-solid repair :
- open the LE closure seam at the tear
- clean the damaged area and dry
- apply Dacron sailtape patches to both sides
- perimeter zig-zag stitch around the outside patch
- re-stitch the LE closure seam

If a stitched repair isn't something you want or are equiped to handle, best to take it to a profession kite or sail repair service
Thank you a lot for the advice . Maybe to be better to leave the kite in a professional :) But I can not understand how would be possible to be repaired without a stich or any sign of repair.

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GregK
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Re: Leading edge repair

Postby GregK » Sun Sep 13, 2020 10:18 pm

Alpa3094 wrote:
Sun Sep 13, 2020 9:43 pm
... how would be possible to be repaired without a stitch or any sign of repair.
Not economically feasible to repair without any sign of repair - that would require a) having a quantity of the dark blue DP Dacron ( maybe possible now that Duotone are making their kite fabrics available for small-quantity purchase on their Replacement Parts webpage ) b) replacing the entire shape section where the tear is located - about 20 time the amount of work compared to a stitched patch.

Up close, there will be visual indications of the repair, but if done professionally, the patch will look like many of the other reinforcements glued and stitched to the kite, and from far away ( when riding ) it won't be discernible.


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